tmp/tmpo7ixyalo/{from.md → to.md}
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| 1 |
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#### Struct `owner_equal` <a id="util.smartptr.owner.equal">[[util.smartptr.owner.equal]]</a>
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The class `owner_equal` provides ownership-based mixed equality
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comparisons of shared and weak pointers.
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``` cpp
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namespace std {
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struct owner_equal {
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template<class T, class U>
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constexpr bool operator()(const shared_ptr<T>&, const shared_ptr<U>&) const noexcept;
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template<class T, class U>
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constexpr bool operator()(const shared_ptr<T>&, const weak_ptr<U>&) const noexcept;
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template<class T, class U>
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constexpr bool operator()(const weak_ptr<T>&, const shared_ptr<U>&) const noexcept;
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template<class T, class U>
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constexpr bool operator()(const weak_ptr<T>&, const weak_ptr<U>&) const noexcept;
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using is_transparent = unspecified;
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};
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}
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```
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``` cpp
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template<class T, class U>
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constexpr bool operator()(const shared_ptr<T>& x, const shared_ptr<U>& y) const noexcept;
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template<class T, class U>
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constexpr bool operator()(const shared_ptr<T>& x, const weak_ptr<U>& y) const noexcept;
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template<class T, class U>
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constexpr bool operator()(const weak_ptr<T>& x, const shared_ptr<U>& y) const noexcept;
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template<class T, class U>
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constexpr bool operator()(const weak_ptr<T>& x, const weak_ptr<U>& y) const noexcept;
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```
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*Returns:* `x.owner_equal(y)`.
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[*Note 1*: `x.owner_equal(y)` is `true` if and only if `x` and `y`
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share ownership or are both empty. — *end note*]
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